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Estimating daytime vertical ExB drift velocities in the equatorial F‐region using ground‐based magnetometer observations
Author(s) -
Anderson David,
Anghel Adela,
Yumoto Kiyohumi,
Ishitsuka Mutsumi,
Kudeki Erhan
Publication year - 2002
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2001gl014562
Subject(s) - daytime , equatorial electrojet , electrojet , magnetic dip , ionosphere , equator , longitude , geology , latitude , geophysics , geodesy , magnetometer , altitude (triangle) , drift velocity , atmospheric sciences , physics , magnetic field , plasma , earth's magnetic field , geometry , mathematics , quantum mechanics
The daytime equatorial electrojet is a narrow band of enhanced eastward current flowing in the 100 to 120 km altitude region within ±2° latitude of the dip equator. A unique way of determining the daytime strength of the electrojet is to observe the difference in the magnitudes of the Horizontal (H) component between a magnetometer placed directly on the magnetic equator and one displaced 6 to 9 degrees away. The difference between these measured H values provides a direct measure of the daytime electrojet current, and in turn, the magnitude of the vertical ExB drift velocity in the F region ionosphere. This paper discusses a recent study that has established the quantitative relationship between the vertical ExB drift velocity in the ionospheric F region and the daytime strength of the equatorial electrojet in the South American (west coast) longitude sector.